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A preparation method of direct solidification injection molding of complex porous ceramics with high porosity

A technology of porous ceramics and high porosity, which is applied to ceramic products, other household utensils, household utensils, etc. It can solve the problems of difficult preparation of porous ceramics, high cost of mold preparation, and low strength of green body, so as to achieve good uniformity and avoid The effect of low strength and lower sintering temperature

Active Publication Date: 2019-12-13
HUAZHONG UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects and improvement needs of the prior art, the present invention provides a preparation method of direct solidification injection molding of high-porosity complex porous ceramics, through direct solidification injection molding process combined with molten salt method, additive manufacturing technology and The molding process can produce high-performance, high-complexity high-porosity full-fiber complex porous ceramics. This method uses additive manufacturing technology to quickly prepare complex-shaped molds for lost foam molding, effectively avoiding direct solidification injection molding. The problem of low strength and difficult demoulding of the green body is to adopt the characteristics of molten salt that is easy to melt into a liquid phase at high temperature, and realize the diffusion and bonding between fibers through the diffusion effect between substances under high temperature melting, so as to solve the existing direct solidification injection molding process Difficulty in preparing porous ceramics, high cost of mold preparation, long cycle time, and difficulty in forming high-performance, high-complexity porous ceramics with traditional preparation techniques

Method used

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  • A preparation method of direct solidification injection molding of complex porous ceramics with high porosity
  • A preparation method of direct solidification injection molding of complex porous ceramics with high porosity
  • A preparation method of direct solidification injection molding of complex porous ceramics with high porosity

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Effect test

Embodiment 1

[0043] 2.5vol% glyceryl diacetate solidified 0.2wt% ammonium citrate dispersed 45vol% alumina fiber slurry containing 40wt% potassium sulfate, the alumina fiber length was 90 μm, and the aspect ratio was 4.

[0044] Mix 100g of alumina fiber, 0.2g of ammonium citrate and 31.3g of deionized water, and ball mill for 150min at a ball milling speed of 250r / min to obtain a ceramic slurry with a solid phase volume fraction of 45vol% negatively charged on the surface, and then add 40g After potassium sulfate, continue ball milling at a rate of 250r / min for 20min, then add 0.78ml of glycerol diacetate, stir with a glass rod for 45s, pour it into a nylon mold prepared by selective laser sintering technology, place it at 85°C for 12h, and then place it in a sintering furnace In the process, the temperature was first raised to 400°C at 3°C / min and held for 4 hours, and then the temperature was raised to 1450°C at 10°C / min and held for 2 hours to obtain a high-porosity full-fiber complex a...

Embodiment 2

[0047] 0.5vol% triacetin solidified 1.0wt% ammonium polyacrylate dispersed 25vol% zirconia fiber slurry containing 5wt% sodium sulfate, the zirconia fiber length was 10 μm, and the aspect ratio was 3.

[0048] Mix 100g of zirconia fiber, 1g of ammonium polyacrylate and 50.9g of deionized water, and ball mill for 50min at a ball milling speed of 400r / min to prepare a ceramic slurry with a solid phase volume fraction of 25vol% negatively charged on the surface, and then add 5g of sulfuric acid After sodium, continue ball milling at a rate of 300r / min for 10min, then add 0.26ml triacetin, stir with a glass rod for 15s, inject it into a photosensitive resin mold prepared by photocuring molding technology, place it at 45°C for 24h, and then place it in a sintering furnace In the process, the temperature was first raised to 600°C at 3°C / min for 2 hours, and then the temperature was raised to 1500°C at 8°C / min for 6 hours to obtain a high-porosity full-fiber complex zirconia ceramic s...

Embodiment 3

[0050] 1.5vol% ethyl lactate solidified 0.5wt% sodium tripolyphosphate dispersed 30vol% silicon nitride fiber slurry containing 20wt% potassium sulfate, the silicon nitride fiber length was 50 μm, and the aspect ratio was 5.

[0051] 100g of silicon nitride fiber, 0.5g of sodium tripolyphosphate and 68.6g of deionized water were mixed, and ball milled for 80min at a ball milling speed of 300r / min to obtain a ceramic slurry whose solid phase volume fraction was 30vol% negatively charged on the surface, and then After adding 20g of potassium sulfate, continue ball milling at a rate of 400r / min for 10min, then add 1.03ml of ethyl lactate, stir with a glass rod for 20s, pour it into a coated sand mold prepared by 3D printing technology, place it at 75°C for 16h, and then place it in In the nitrogen atmosphere sintering furnace, first raise the temperature at 5°C / min to 800°C for 3 hours, then raise the temperature at 8°C / min to 1750°C for 4 hours to obtain a high-porosity full-fibe...

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Abstract

The invention belongs to the field of preparation of inorganic nonmetallic ceramics and particularly relates to a direct coagulation casting preparation method of high-porosity complex porous ceramic. The direct coagulation casting preparation method comprises the following steps: firstly, mixing ceramic fibers, a dispersant and deionized water, and fully performing ball-milling to obtain a ceramic slurry; adding fused salt, performing ball-milling, then adding an ester pH regulator into the ceramic slurry, performing uniform stirring, injecting the slurry into an imporous die for additive manufacturing, and performing curing and drying; and at last, placing the imporous die in a sintering furnace to be sintered to obtain the high-porosity all-fiber complex porous ceramic sintered body. The direct coagulation casting process is combined with the molten-salt growth method, the additive manufacturing technology and the lost foam casting process to prepare the high-porosity all-fiber complex porous ceramic, demoulding is not needed, the sintering temperature is low, and the prepared ceramic sintered body is high in strength and porosity. The direct coagulation casting preparation method also has the advantages that the operation is simple, the shape of the die can be designed, the preparation period is short, the preparation cost is low, and the method is suitable for any electronegative ceramic slurry.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic non-metallic ceramics, and more specifically relates to a direct solidification injection molding preparation method of complex porous ceramics with high porosity. Background technique [0002] Porous ceramic materials have the advantages of extremely high specific surface area, good chemical stability, high corrosion resistance, high hardness, wear resistance, high temperature resistance, non-toxic and harmless, etc., and are widely used as catalyst carriers, filter materials, thermal insulation materials, sound-absorbing materials, etc. With the development of science and technology, the demand for porous ceramic materials in aerospace, military equipment, metal-ceramic composite materials and other new application fields is more urgent, and higher requirements are put forward for its performance and shape complexity. At present, the traditional methods of preparing porous ceramics inclu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/626C04B35/622C04B35/63C04B35/632C04B35/634C04B35/10C04B35/48C04B35/584C04B35/14C04B35/185C04B35/80
CPCC04B35/10C04B35/14C04B35/185C04B35/48C04B35/584C04B35/622C04B35/6261C04B35/62625C04B35/6303C04B35/632C04B35/63424C04B38/0038C04B2235/5228C04B2235/5232C04B2235/5236C04B2235/524C04B2235/5224C04B2235/6023C04B2235/6562C04B2235/6567C04B2235/444C04B2235/448C04B38/0074
Inventor 吴甲民陈安南刘宇轩肖欢陈敬炎史玉升贺智勇
Owner HUAZHONG UNIV OF SCI & TECH
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